3 Answers
3

The term wet refers to the connectedness of the community cards. It's translatable to most all variants of poker depending on the game mechanics.

Specifically, there are three things to consider when judging the wetness of a board,

Highness (Aces, Kings, Queens,...). The higher the cards, the wetter the board.

Suitedness (Monotone or all one suit; Two-Tone; or 'Rainbow' noting all different suits).

Connectedness (The proximity/coordination of the cards in rank to each other). A board of Ace, King, Queen, is very coordinated. A board of King, 7, 2, is wholly uncoordinated.

There are nuances regarding wetness. Wetness is relative to the opponents range. This is important when considering how to proceed against specific opponents, as the same board isn't wet for all types of opponents. For example, vs a tight opponent, a board consisting of high, suited, connected cards is wet, but not necessarily so for an opponent who is very loose. This is after consideration of the width of an opponents likely range.

A paired board is usually considered fairly dry - opponent is less likely to have hit it because there are fewer outstanding cards that hit, and there can't be a flopped straight or flush (and even JJT doesn't offer as many straight draws as JT9).
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Karl KnechtelJan 30 '12 at 2:06

I know this has been answered, but I would like to offer a simple definition.

A wet board is one on which a single pair is not a significant favorite against a significant portion of a non-air range.

For example, on [Tc 9c 7d] continuing ranges that hit do not contain significant sub-ranges which are huge underdogs to any single-pair hand. This is not true for a board like [7h 2d 2c] on which hands like 66-33, comprising a fair amount of continuing hands, have poor equity versus a better pair.

I don't like defining wetness relative to a situation-specific range since it makes sense to speak about how your opponent perceives the board texture to have connected with your own range (the texture can thus be wet even though Villain's action-inferred range does not connect).

Interesting point of view. Although the last paragraph seems to me to contradict itself, can you explain further?!
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Toby Booth♦Jul 15 '12 at 19:52

I mean that I prefer to use the term wet solely to describe the texture property of a board irrespective of opponent ranges. Otherwise it's confusing to call a board like [9d 8d 7s] dry in, say, a 4-bet pot where Villain can only have {AA-QQ,AK}. In those cases I simply say, "The board is wet but misses Villain's range."
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Loc NguyenJul 15 '12 at 20:20

Ok, I see. I understand why you'd do this to avoid difficulty in categorizing flops. I'd say it's better though to consider wetness as "always relative to an opponents range". For instance, if your opponent has no hand at all (mucked), in your definition a board still has a texture which obviously can't be true. It's just semantics I suppose but I like to make discussion as easy as possible through consistent use of terminology :)
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Toby Booth♦Jul 15 '12 at 20:43

Yeah, it's kind of arbitrary semantics, but from a teaching perspective texture comes way before ranges (at least a deep understanding), so it might be overload to take what is essentially "How scary is this board?" and turn it into a multi-step mental exercise. I think advanced players talk about action logic more than board categorization anyway.
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Loc NguyenJul 15 '12 at 21:33